The 'origin' of this custom/tradition is not known. = The 'origins' of this custom/tradition are not known. [=no one knows how this custom/tradition started]
He comes from 'humble origins'. [=he comes from a family that did not have high social status or much money]
The English word “rendezvous” is French 'in origin'. [=the English word comes from French]
(..) So, the earliest mention of the word "zombie" was in a memo from Camp Humphreys in South Korea. We haven't had contact with them since. But this could lead us to the origin. If we knew where this thing started, then we'd have a chance of developing a vaccine to stop it. So we send in Dr. Fassbach (..)2013 World War Z
(..) aren't affected immediately. It is viral. it has to be viral. There is no plausible alternative. And like any virus, once we find its origin, we can develop a vaccine. - We find it, contain it.. - That's Dr. Fassbach. Virologist from Harvard. The analogy I keep coming back to is Spanish Flu. (..)2013 World War Z